Carton forming machine



Nov. 12, 1940.

E. G. JuRGENs TAL CARTON FORMING MACHINE Filed June 7, 1939 6 Sheets-Sheet 1 Nov. 12, 1940. E. G. JURGENS mL 2220.960 y CARTON FORMING MACHINE Filed June 7, 1939 `es sheets-snee: 2

Nov. 12, 1940. E. G. JuRGENs Erm. Y 21,220,960

CARTON FORMING MACHINE 6 Sheets-Sheet 3 Filed June '7. 1959 Nov. l2, 1940. E. G. JURGENS ETAL CARTON FORMING MACHINE Filed Jun'e 7, 1939 e sheets-sheet 4 Nov. 12, 1940. E. G. JURGENs Erm.

CARTON FORMING MACHINE 1 Filed June 7, 1939 e sheets-sheet Nov. l2, 1940.

E. G. JURGENS ETAL CARTON FORMING MACHINE Filed June '7, 1939 6 Sheets-Sheetr Patented Nov. 12, 1940 PATENT oFFlcE 2,220,960 CARTON FoRMING MACHiNE Emil G. Jurgens and` Hazen K4 Becker, Chicago, Ill., assignors to Peters Machinery Company, Chicago, Ill., a corporation of Illinois Application June 7, 1939, Serial No. `277,752

2 Claims.

This invention relates to the folding of carton blanks and lining paper into carton form, while also tucking interlocking end portions into proper engagement and delivering the formed cartons with .the lid portion and lining material open for receiving the contents to be packaged, such asbutter, lard, crackers, etc.

Machines for doing similar work are disclosed in the patent to Peters No. 1,025,880 of May 7, 1912, Jurgens et al. No. 1,919,787 of July 25, 1933,

and patent to Munn et al. No. 2,135,409 of November 1, 1938,

The purposes of the invention are to improve such machines, with reference to -feeding carton blanks, stripping cartons from the forming blocks. and to the certainty and ease of performance, by an arrangement and design of operating elements having action during the maximum number of degrees in an operating cycle, and with the various forming elements, acting upon a carton blank relatively fast or slow for dependable action while the entire cycle of operation takes place with rapidity. Y

'I'he invention may be utilized by means of a construction as illustrated in thedrawings,`

wherein:

Figure 1 shows the machine in side elevation.

Fig. 2 is a fragmentary rear view, partly broken away and partly in section. y

Fig. 3 is a fragmentary front view, partly in section.

Fig. 4 is a plan view o f one of the standard forms ofv carton blank for which the machine is designed torfold into carton form.

Fig. 5 is another side elevation of the machin bringing out'the relationship of the principal operating elements. and with the frame structure l and motor omitted. t l p Fig. 6 is an enlarged fragmentary detail in side o .elevation to illustrate the rst folding action on the carton blank shown therein by the dot andy dash line.

Fig. 7 is an enlarged fragmentary detail illustrating the second folding operation on the blank. 5 Fig. 8 is an enlarged fragmentary detail in side elevation illustrating the third folding action.

Fig. 9 Ais. a sectional detail taken on the line 9-9 of Fig. `8.

Fig. 10 isjan enlarged fragmentary detail in side elevation illustrating the closing operation.

Fig. 11 is a sectional view taken on the line lI-IlofFig.10. Q

, Fig. V12 is a fragmentary detail in sideelevation like Fig. 10, but illustrating-a continuation of the closing operation and showing the carton closed.

Fig. 13 is a sectional detail taken on the line |3--I3 of Fig. 12.

Fig. 14 shows in side elevation mechanism for feeding carton blanks to the machine.

Fig. 15 is an enlarged detail of carton blank gripping elements of the feed mechanism.

Fig. 16 is an enlarged` detail in planto illustrate means for opening slits in the carton end flaps to insure interlocking of the flaps during the carton closing operation. p

Fig. 17 is a side view partly in section of mechanism shown in plan by Fig; 16.

'I'he mechanism of carton folding machines, by this invention, is revised and refined for better performance.

In this machine lthe carton blanks and lining paper are received in successive pairs on a substantially horizontal rest which is in the path of movement of one or more forming blocks around which the carton blanks and lining paper are folded. 'I'he forming blocks are carried by arms radial from the main shaft of the machine which may be horizontal, as indicated by the drawings.

r The forming blocks swing through openings in an interlocking tongue on one ap to enter aslit on another flap and thus complete the forming operation.

In the drawings the operating elements for` folding a carton around forming blocks are numbered l to 6 inclusive in the order in which these elements operate on the blanks.

The blank shown in Fig. 4 has its foldable parts numbered I' to 6 inclusive in the order in which these parts of the blank are'actei upon by the correspondingly numbered .parts of the machine.

A block around which :the cartons are formed vhas the reference character A, `(Fig. 1), and the part of the carton blank forming the bottom of ,the carton which is engaged bythe end of the block is marked A'.

The forming blocks are hollow aluminum castings and are made fast to the ends of carryingarms 'I forming a spider fast to a horizontal shaft 8. Theshaft 8 is journaled in a frame structure 9 and is driven by motor I0 through reduction 55", f1

the blank rest for` successively lifting blanks into 10 the 5 which, through beveled gearing, drives rubber f surfaced rollers I1 which strip the formed cartons from the blocks. A. 'I'he peripheral speed of the stripping rollers I1 exceeds the angular movement of the forming blocks.

Shaft 8 carries fast asprocket I8 for driving a chain I9. Chain I9 passes around sprockets 20, 2l and 22 for respectively driving the carton blank feeding arms 23, carton end flap, folding cams I through cam 24, and carton slit opening arms 6 through cam 25. Chain I9 also passes around an idler or tightening sprocket 26.

The blank feeding arms 23 are timed to move carton blanks and lining paper placed in chute 21 onto angle-bar rests 28 in advance of the blocks A arriving at the blank-engaging position. The carton blanks and lining paper come to rest against al-inement bar 29.

Another form of lining paper and blank feed mechanism is illustrated by Fig. 14, essential parts of which are oscillating gripping jaws that are timed to carry the lining paper and carton blanks from rest 30 to a support 3| vupon which the edges of the carton blanks rest and having an opening through which the forming blocks pass. This form of feeding mechanism is driven by shaft 32 which carries a crank 33 connected by rod 34 with an arm 35. Arm 35 is rigid with another arm 33 for the purpose of oscillating arm 36 once for each rotationof shaft 32. At itsA upper end arm 36 carries fast a blank gripping element 31 for cooperation with a gripping jaw 38 pivoted to the arm 36 at 39. The jaw 38 hasy an angular extension 4I)v connected by a spring 4I with a pin 42 fixed on arm 36. This spring forms a toggle operating means for jaw 38 to swing the jaw to its open or closed positions when the spring passes dead center. The swinging offthe jaw in either direction is started by the stationary opening stop 43 and the stationary closing stop 44;

- 45 when arm 36 reaches the limits of its stroke.

There is a pair of these grips near each side of the feed table 30 for the purpose of gripping carton blanks at the corners of their leading `edges and to bring the blanks successively into position for folding at rest against the stop 45. In this position the bottom forming portion A' of the carton blank, Fig. 4, is engaged by one of the forming blocks A as the block swings in the direction indicated by arrow 46, Fig. 1. K

The blank is carried upward by the block and its side flaps I' are first engaged and folded inwardly by theicam elements I. Cams I are rapidly swung inwardly at this time to complete the so folding of flaps I' in advance of the folding of flaps 2 by the xedcam members 2. Cam arms I are driven by rotating cam 24 and restored by spring 41.

There are fixed curved cam surfaces 3 and 3A engaged by the carton blank at the back wall portion thereof 3 and the front wall forming portion thereof 3A. These walls of the carton-are bent inwardly with reference to the bottom forming portion A along the scored lines between the bottom and the side walls. The back-forming portion of the blank 3' and the top-forming por- V tion 5' ride along the surface 48, 'a continuation of 3, while an arm 49 hinged to the forming block rests on the opposite side of the blank and prevents inward buckling thereof andaids in holding the lining paper'nat against the inner surface of the carton blank. Arms 49 swing by gravity and their motion is limited by the hook-shaped stops 50 engaging the wall of block A.

lThe inclination of surface 48 is such as to graduallycomplete the folding of the back sections 3' and top section 5 inwardly from the bottom forming portion A' of the caiton blank. At the same time, xed plow-share shaped cam elements 4 engagethe end nap portions 4' of the blank and fold the end portions inwardly toward end flaps I'. Due to the inclination of surface 48 and particularly the cam rise 5 the lifting ofthe back and top-forming portions 3 and 5' cause the end naps 4' to slide over flaps I toward the tabs 6' cut therein. These tabs are pressed inwardly by the oscillating fingers 6 before theinterlocking tongues 52, Fig. 4, ,enter the flaps I' at the slits 53. The interlocking tongues 52 hook into the corners 54 of the slits when pressure on l the formed box is relieved due to the box passing cam 5. The formed cartons are stripped from the forming blocks A by rubber-surfaced rollers I1, the peripheral speed of which exceeds the motion of the blocks in the same direction.

The oscillation of slit opening fingers 6 is effected by cam 25, Figs.'16.and 17. The noses 55 of the cams act in opposition to restoring springs 56.

Reference characters used 'in the foregoing'description of Figs. 1 and 4 are to some extent repeated in the detailed Figures 6 to 13, inclusive, and the successive operations on the blanks may be followed through these figures in the order numbered. The carton-forming blanks are indicated therein by the dot and dash lines 51.

The operation of the machine is the same whether the blanks alone are folded into carton form or such blanks are folded with lining paper. In supplying blanks to the machine they are placed individually upon, for example, table 30,

Fig. 14. The upper side of the blank becomes the outer surface of the formed carton; hence, if lining paper is used the lining paper is placed beneath theblank. The feeding means mounted on arms 36 insures that the blanks are carried into rcooperative relationship with the forming blocks in the proper timed relationship with the travel of the blocks. The gripping fingers vat the upper ends of arms 36, as previously mentioned, engage the carton blanks at the forward corners thereof at the top of Fig. 4. The blanks are released when lined up with the stop 45. Next the upward movement of a forming block engages the blank at the portion A which forms the bottom of the carton. Then the ends and sides of the blank are folded against the block by engagement with the elements I, 2, 3 and 3A, Fig. 6. The folding arms I have a rapid inward movement and the remaining folding elements are stationary. A continuation of the action is illustrated byFigs. 1, 8, 10 and 12. The upward motion of the carton back 3' and the top 5' due to riding along eccentric surface 48 and cam 5 causes the interlocking tongues 52 of the carton, Fig. 4, to enter slits 53 which are held open by fingers 6, Fig. 5, the forming blocks having a depression in their side walls to allow inward movement of the carton material at that point.

We claim:

Y1. A machine for folding and interlocking fiat paper blanks into carton form comprising a forming block, means for driving said block in a continuous circuit, carton blank feeding means inblanks into the path of movement of said block,

means for folding blanks around the forming block when engaged thereby, consisting of a pair of oscillating arms for folding slotted end projections of the blank against the sides of the forming block, and stationary cams for engaging the remaining foldable elements of the blank and moving such elements of the blank toward the forming block during thepassage of said block along said stationary cams.

2. A carton forming machine including continuously driven forming blocks, means for intermittently feeding carton blanks into the path of travel of said blocks, forming elements for i wrapping carton blanks around the blocks including a stationary cam for folding carton back forming portions of blanks against the 'forming blocks and simultaneously causing tongue-form portions of the blanks to enter slit portions of the blanks, and each of said forming blocks having a member pivoted thereto for engaging inner surfaces oi' the blanks opposite the cam-engaged areas thereof for preventing buckling of the material operated upon during the forming engagement. n

EMIL G. JRGENS. `HAZEN K. BECKER. y 

